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Alternator A.R.K4C

A.R.K4C Alternator – Brushless, Efficient, and High-Performance Power Generation

The A.R.K4C alternator, designed for industrial and commercial generator applications, is a three-phase brushless synchronous alternator featuring AVR-controlled voltage regulation for superior stability. Delivering reliable output at 50/60 Hz, it maintains ±1% voltage regulation and <5% THD under balanced linear load conditions. With Class H insulation, IP23 protection, and self-excited excitation system, it ensures long-lasting durability and exceptional electrical performance. Manufactured under ISO 9001 quality standards and compliant with IEC 60034, BS 5000, and NEMA MG1-22, the A.R.K4C alternator offers dependable, efficient power for prime, standby, and mobile energy applications.

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Alternator Model

A.R.K4C

50Hz (kVA)

250

60Hz (kVA)

294
Control SystemSELF EXCITED

Electrical Performance

  • Rated Power Factor: 0.8
  • Voltage Range (Series Star): 380/220V – 440/254V (50Hz) / 416/240V – 480/277V (60Hz)
  • Frequency: 50 / 60 Hz
  • Voltage Regulation: ±1.0%
  • Waveform Distortion:

    • No load: <1.5%

    • Balanced linear load: <5.0%

  • Sustained Short Circuit Current: >300% of rated current for 10 seconds
  • Short Circuit Ratio (1/Xd): 0.09 (typical)
  • Reactances:
  • X’d (Transient): 0.2

    • X’’d (Subtransient): 0.14

    • Xq (Quadrature): 2.71

    • X’’q: 0.39

  • Transient Time Constant (T’d): 0.08 s
  • Subtransient Time Constant (T’’d): 0.019 s
  • Armature Time Constant (Ta): 0.018 s
  • Efficiency: Up to 93.4% at full load

Construction & Design

  • Insulation System: Class H (125°C rise at 40°C ambient)
  • Protection Class: IP23
  • Structure: Cast aluminum front and rear covers; rigid steel frame
  • Cooling: Self-ventilated airflow – 0.486 m³/s (1030 CFM @50Hz)
  • Bearings:
  • Drive End: 6317 (sealed-for-life ball bearing)
  • Non-Drive End: 6314
  • Rotor: Damped rotor with double-layer stator winding (2/3 pitch design)
  • Winding Leads: 12 leads – reconnectable (star/delta/parallel)
  • Overspeed Capability: 120% of rated speed (2250 rpm)
  • Weight: 850 kg (complete generator)
  • Moment of Inertia (WR²): 3.55 kg·m²

Regulation & Control

  • Excitation System: Self-excited, brushless
  • AVR Options: SX460 (standard), SX440, AS440, MX341, MX321
  • Voltage Regulation Accuracy: ±1.0%
  • Parallel Operation: Available (with optional AVR models)
  • Low-Speed Voltage Drop Protection: Standard
  • RFI Suppression: BS EN 61000-6-2 & BS EN 61000-6-4 compliant

Environmental Parameters

  • Operating Temperature: –15°C to +40°C
  • Relative Humidity: Up to 95% non-condensing
  • Altitude: Up to 1000 m without derating
  • Cooling Air Flow: 0.486–0.580 m³/s (depending on frequency)
  • Noise & Vibration: Balanced per BS6861 mechanical standards

Performance Summary

  • Efficiency Curve: 92–93.4% across load range
  • Voltage Dip (Transient Load): ≤25% at 0.8 PF
  • Recovery Time: <0.5 seconds
  • Locked Rotor Motor Starting: >300% of rated current
  • Continuous Overload: 110% for one hour in six-hour cycle

Datasheet

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